292 



THE ARTICULATIONS 



articulation ; a second for the anterior calcaneo-astragaloid and astragalo-navicular 

 articulations ; a third for the calcaneo-cuboid articulation ; and a fourth for the 

 articulations of the navicular with the three cuneiform, the three cuneiform with 

 each other, the external cuneiform with the cuboid, and the middle and external 

 cuneiform with the bases of the second and third metatarsal bones, and the lateral 

 surfaces of the second, third, and fourth metatarsal bones with each other ; a fifth 

 for the internal cuneiform with the metatarsal bone of the great toe ; and a sixth 

 for the articulation of the cuboid with the fourth and fifth metatarsal bones. A 

 small synovial membrane is sometimes found between the contiguous surfaces of the 

 navicular and cuboid bones. 



Nerve-supply. The nerves supplying the tarso-metatarsal joints are derived 

 from the anterior tibial. 



The digital extremities of all the metatarsal bones are connected together by 

 the transverse metatarsal ligament. 



The Transverse Metatarsal Ligament is a narrow fibrous band which passes 

 transversely across the anterior extremities of all the metatarsal bones, connecting 



FIG. 193. Oblique section of the articulations of the tarsus and metatarsus. Showing the six synovial 

 membranes. 



them together. It is blended anteriorly with the plantar (glenoid) ligament of 

 the metatarso-phalangeal articulations. To its posterior border is connected the 

 fascia covering the Interossei muscles. Its inferior surface is concave where the 

 Flexor tendons pass over it. Above it the tendons of the Interossei muscles pass 

 to their insertion. It differs from the transverse metacarpal ligament in that it 

 connects the metatarsal bone of the great toe with the rest of the metatarsal bones. 



VIII. Metatarso-phalangeal Articulations. 



The metatarso-phalangeal articulations are of the condyloid kind, formed by the 

 reception of the rounded head of the metatarsal bone into a superficial cavity in the 

 extremity of the first phalanx. 



The ligaments are 



Plantar. Two Lateral. 



The Plantar Ligaments (Glenoid ligaments of Cruveilhier) are thick, dense, 

 fibrous structures. Each is placed on the plantar surface of the joint in the 

 interval between the lateral ligaments, to which they are connected ; they are 

 loosely united to the metatarsal bone, but very firmly to the base of the first 

 phalanges. Their plantar surface is intimately blended with the transverse meta- 

 tarsal ligament, and presents a groove for the passage of the Flexor tendons, the 

 sheath surrounding which is connected to each side of the groove. By their deep 



